#9 Control brightness on desktop
Opened 2 years ago by glb. Modified 2 years ago

It would be nice to be able to adjust brightness level on a desktop monitor just like one does with laptops, turns out you actually can.

Using the Display Data Channel or DDC, brightness level can be adjusted from the standard Gnome brightness controls. This is implemented in the following kernel module

https://gitlab.com/ddcci-driver-linux/ddcci-driver-linux

and the wiki for Fedora 31 is here

https://gitlab.com/ddcci-driver-linux/ddcci-driver-linux/issues/12

Research sources for the wiki issue

https://unix.stackexchange.com/a/546329
https://docs.fedoraproject.org/en-US/fedora/rawhide/system-administrators-guide/kernel-module-driver-configuration/Working_with_Kernel_Modules/#sec-Persistent_Module_Loading

Addendum:
This article needs to mention what are the hardware limitations if any.


Metadata Update from @glb:
- Issue tagged with: article

2 years ago

Metadata Update from @glb:
- Issue assigned to anothergituser

2 years ago

On Dec 13, 2019 anothergituser commented:

From wikipedia, DDC was first introduced in 1998 and later revisions added support for HDMI in 2004 and DisplayPort in 2007. As for other issues this is quoted from wikipedia
"Some KVM switches (keyboard-video-mouse) and video extenders handle DDC traffic incorrectly"

I'm using this with an LG 24UD58 monitor, maybe from 2016

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